Continuity mistake: When Scully walks into Mulder's office, she stops in the position with the "I want to believe" poster in the background, then she takes a couple of steps to make acquaintance with Mulder, and she finds herself again in the position with the poster in the background. (00:05:15)Chop Luftmysza
Continuity mistake: When Mulder and Scully are driving after their plane lands, we see at one point that Mulder has his left hand on the wheel and he is eating a sunflower seed with his right, yet when the shot changes he's driving with his right hand and eating with his left. (00:09:45)Chaz1003
Continuity mistake: When Mulder, Scully and the other police officers are digging Ray Soames's grave, one strap of the coffin breaks and the coffin falls and starts to roll. When it hits a tomb stone and opens, you can see there's a normal size body in the coffin. When they look into the coffin, there's this small alien body. (00:13:35)sam68
Continuity mistake: When Scully is in her room after the autopsy, we see the x-ray attached to her lamp. When we first see it, we can see the letters LD on it, yet when the shot changes back to the x-ray after Mulder has gone, we can only see I, presumably the other x-ray is now overlapping it. (00:15:20 - 00:16:10)Chaz1003
Continuity mistake: When Tooms is in the cell right at the end, we see when his food is being brought over to him on the tray that there is a drink and a bun, when the shot changes to the other side of the door the drink and bun have swapped sides. When the shot changes back to the other side of the door, the tray is now the other way around and then when the shot goes back to the other side the whole tray has now disappeared. (00:39:40)Chaz1003
Visible crew/equipment: I don't know if this is visible in all formats, but on the newest UK release on DVD, watching in widescreen, it's amazingly obvious. When Mulder recovers from the vampire attack, he gets up from the floor and breaks up a chair to make a stake. There is a shot of his feet as he smashes the legs off and bends to pick up a piece. In the bottom left hand corner of the screen, you can see a crew member's hand carefully and quickly placing a piece of wood on top of the pile for Mulder to pick up.